The chin's skin is where the mentalis muscle inserts.
The incisive fossa of the jaw is where the mentalis muscle is derived. At the level of the mentolabial sulcus, its short fibres insert to the skin of the chin. The lower lip's skin serves as the mentalis muscle's entry place. Because it is attached to the lower lip's skin, when this muscle contracts, the lower lip rises and protrudes. The mentalis muscle, highlighted in red, enters into the lower lip's skin after growing from the jaw.
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